Dendrocoelopsis piriformis is a species of freshwater triclad in the family Dendrocoelidae.

Though not explicitly stated in the original publication, the specific epithet is from the New Latin piriformis, meaning "pear-shaped", deriving from the shape of the species' body, which Roman Kenk explicitly describes as "pear-shaped" in his original description.

It has a truncated head with two small auricles, the protruding of which creates the appearance of a neck.

Its body has been described as a "cloudy brown or dark brownish gray" in color.

Between the species' eyes, there is a dark field of pigment that extends to both sides of the worm's grasping organ.